Okay, here goes....
I had the Ravens installed on the 1st of June and have since put about 1600 miles on them. The mileage has been a mixture of surface street/freeway commuting and well, let's say "spirited" sport touring. My initial impressions have been that compared to the stock Bridgestone BT56's, these tires have a flatter profile. The best I can explain this without being able to show you the two tires side by side is to say that the stockers were a bit more triangular. Supersport tires like the Michelin Pilot Powers, Dunlop Qualifiers, Pirelli Diablo Corsas, etc. all have a very elliptical shape which drastically increases the rider's ability to turn in to corners faster and also to make a quick transition from side to side. Flatter profiled tires are necessarily a bit more laborious to throw into a turn. The reason that i say that they are necessarily so is that tires like the Ravens are designed for higher mileage at the expense of ultimate stickyness. Don't read into that last statement too much...these tires are pretty sticky. I'm no slouch in the twisties.
The Ravens hook up very well from a standing start stoplight to stoplight. The stockers tended to spin occasionally under a heavy throttle hand.
As for warm-up time, I would say that they warm up as quick or quicker than the stockers, but slower than Pilot Powers.
Tread depth on the Ravens is deeeeeeep!! The grooves, which strangely resemble that of our beloved kanji symbol, are cavernous. I expect no less than 8000 miles from the rear and more from the front, barring any road hazards.
As for price...they can't be beat. I had my set installed for under 200 bucks.
I cannot comment on their performance in the wet stuff....cause...well...I live in Arizona and it doesn't rain here...ever.
For those of you who use your busa as a daily driver/ primary vehicle to commute to work with the regular weekend blast up the mountain, these are great tires. If you are looking for a super sticky, canyon carving occasional track day tire, I would advise against the Ravens.
Hope this helps...